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Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We consent to the use in this Registration Statement on Form S-1 of our report dated November 22, 2006 relating to the consolidated financial statements of Interactive Brokers Group LLC, appearing in the Prospectus, which is part of this Registration Statement, and of our report dated November 22, 2006 relating to the financial statement schedule appearing elsewhere in this Registration Statement.

        We also consent to the reference to us under the heading "Experts" in such Prospectus.

/s/ DELOITTE & TOUCHE LLP
New York, New York
November 27, 2006

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM